An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Concept Breadcrumbs

Preferred Term:


A refractive error in which rays of light entering the EYE parallel to the optic axis are brought to a focus in front of the retina when accommodation (accommodation, ocular) is relaxed. This results from an overly curved cornea or from the eyeball being too long from front to back. It is also called nearsightedness.
Concept Schemes:
Broader Concept:
Entry Terms:
  • near-sightedness
  • nearsightedness
Download this Concept:
RDF/XMLCreated 2016-09-16, last modified 2016-11-14